Name:
Date:
Ex: A car travels 60 miles at 20 mph and 80 miles at 40 mph. What is its overall average
speed?
Ex
Parts
1st Part
Time
t = d ÷ s [t = 3]
Distance
60 miles
Average Speed
20 mph
2nd Part
t = d ÷ s [t = 2]
80 miles
40 mph
Totals
Total time = 5 hours
Total Dist = 140 miles Av Speed = Total Distance ÷
Total Time
Average Speed =
140 ÷ 5 = 28 mph.
Q1.
Ex
A car travels 120 miles at 40 mph and 120 miles at 60 mph. What is its average speed?
Parts
1st Part
Time
t=d÷s[
Distance
] d=s×t[
2nd Part
t=d÷s[
] d=s×t[
Totals
Total time =
[
Q2.
Ex
]
Average Speed
s=d÷t [
]
]
s=d÷t [
]
Total Distance =
]
[
Average Speed =
Total Distance ÷ Total Time
Average Speed =
[
]
]
For 2 hours of a 100 mile journey the average speed is 30 mph and the average speed of
the remainder is 40 mph. What is its overall average speed?
Parts
1st Part
Time
t=d÷s[
Distance
] d=s×t[
2nd Part
t=d÷s[
] d=s×t[
Totals
Total time =
[
Rule 1: Distance = Speed x Time
Total Distance =
]
[
Rule 2: Speed = Distance ÷ Time
]
]
Average Speed
s=d÷t [
]
]
s=d÷t [
]
Average Speed =
Total Distance ÷ Total Time
Average Speed =
[
]
Rule 3: Time = Distance ÷ Speed
Name:
Date:
Q3. On an outward journey of 240 miles a motorist takes 6 hours and on the return journey
he takes 2 hours less. a) Calculate the outward journey speed. b) Calculate the return
journey speed? c) Calculate the overall Average speed of the whole journey.
Ex
Parts
1st Part
Time
t=d÷s[
Distance
] d=s×t[
2nd Part
t=d÷s[
] d=s×t[
Totals
Total time =
[
Q4.
Ex
Ex
]
]
s=d÷t [
]
Total Distance =
]
[
Average Speed =
Total Distance ÷ Total Time
Average Speed =
[
]
]
An aeroplane travels 1000 km in 2 ½ hours. What is its speed? It then travels for 5 ½
hours at a speed of 800 kmh. a) How far has it travelled altogether? b) What is the
total time taken? c) Calculate the overall Average speed.
Parts
1st Part
Time
t=d÷s[
Distance
] d=s×t[
2nd Part
t=d÷s[
] d=s×t[
Totals
Total time =
[
Q5.
]
Average Speed
s=d÷t [
]
Average Speed
s=d÷t [
]
]
s=d÷t [
]
Total Distance =
]
[
Average Speed =
Total Distance ÷ Total Time
Average Speed =
[
]
]
A plane travels for 3 hours at 500 kmh and for 2 hours at 650 kmh. a) Calculate the
total distance travelled. b) What is its overall average speed?
Parts
1st Part
Time
t=d÷s[
Distance
] d=s×t[
2nd Part
t=d÷s[
] d=s×t[
Totals
Total time =
[
Rule 1: Distance = Speed x Time
Total Distance =
]
[
Rule 2: Speed = Distance ÷ Time
]
]
Average Speed
s=d÷t [
]
]
s=d÷t [
]
Average Speed =
Total Distance ÷ Total Time
Average Speed =
[
]
Rule 3: Time = Distance ÷ Speed
Name:
Date:
Q6. A car travels for 2 hours at 25 mph and 90 miles at 30 mph. a) Calculate the total time.
b) Calculate the total distance travelled? c) Calculate the overall Average speed of the whole
journey.
Ex
Parts
1st Part
Time
t=d÷s[
Distance
] d=s×t[
2nd Part
t=d÷s[
] d=s×t[
Totals
Total time =
[
Q7.
Ex
Ex
]
]
s=d÷t [
]
Total Distance =
]
[
Average Speed =
Total Distance ÷ Total Time
Average Speed =
[
]
]
Calculate the overall average speed of a journey of 180 miles where the first 120 miles
are travelled at an average speed of 40 mph and the remainder at an average of 30
mph.
Parts
1st Part
Time
t=d÷s[
Distance
] d=s×t[
2nd Part
t=d÷s[
] d=s×t[
Totals
Total time =
[
Q8.
]
Average Speed
s=d÷t [
]
Average Speed
s=d÷t [
]
]
s=d÷t [
]
Total Distance =
]
[
Average Speed =
Total Distance ÷ Total Time
Average Speed =
[
]
]
A motorist drives for 3 ½ hours at a speed of 50 mph. he then travels for 2 ½ hours at a
speed of 60 mph. What is its overall average speed?
Parts
1st Part
Time
t=d÷s[
Distance
] d=s×t[
2nd Part
t=d÷s[
] d=s×t[
Totals
Total time =
[
Rule 1: Distance = Speed x Time
Total Distance =
]
[
Rule 2: Speed = Distance ÷ Time
]
]
Average Speed
s=d÷t [
]
]
s=d÷t [
]
Average Speed =
Total Distance ÷ Total Time
Average Speed =
[
]
Rule 3: Time = Distance ÷ Speed